Charge 6 - Heart rate not accurate during exercise

[jrs2021]

My Charge 6 does not accurately record heart rate during exercise. I’ve had Fitbit trackers for years and the Charge 6 rarely shows anything above 100 beats. I’m doing very similar workouts but now I rarely get very many zone minutes. Very frustrating. Anyone else have this issue?

Moderator edit - updated subject for clarity

[Agemaze]

Mine is consistently ten to twenty off and have had for 2 months. I reset my goals  ranges WAY way way down to get it to register at all. There are not very good ranges to pick from and you can’t set the ranges at all. I work out daily, yes daily and it tells me I’m maintaining in one place and overtraining at the same time. I have a sense of humor so that helps some.

[Nuke21]

Is your arm or sensor dirty? Is it tight enough against your wrist? Is there a lot of hair between the watch and your arm? (no clue if either of these affect it or not) The accuracy of my charge 6 is literally the only reason I haven't thrown it away yet. When I am going to workout I tighten the watch by one notch. Mine is accurate to 1-2 BPM of any machine I test mine on. Sometimes it takes about 3-5 minutes working out for the heart rate on the watch to sort of "wake up" and start accurately detecting for mine.

[Agemaze]

The watch worked fine for about 3 weeks. Same place,same maintance routine
and I am virtually hairless. The problems has been consistent For the last
12 weeks since the cardio load program came on line. I have a heart
condition on rate meds so I do use another monitor during work outs for
that. It was accurate and I was so thrilled for 3 weeks, now its crap. I
switched from a garmin that wore out.I hated it because it wouldn't load my
steps and started just turning off during work outs but It never was so OFF
on my heart rate.

The reason it pisses me off is I can NOT turn of the cardio load
thing.THAT's when it all started. I hate that it tells me I have no cardio
load with a 2 hour work out. I don't just work out, I TRAIN. I only do
cardio train 1-2 days per week. With my heart condition I WILL push myself
too hard and that is dangerous. I just add 20 beats and leave it alone now.
No use in fighting it.

[Renedezoete]

I have experienced the same issue. I'm a long time user of Charge 3, 5 and Charge 6. In certain exercises my heart rate suddendly shows a peak. My HR doubles to 120+ in seconds and  when I stop it goes down to 60 in 1-2 seconds. I experience this issue now for three weeks, every day. 

I started comparing this with other devices like Charge 5 and other medical devices, and they show there is no peak at all!

In the past you could email Fitbit for help and that worked perfectly, but now you don't get support at all!